Resistance



April 4, 1939- G. J. MUCHER 2,153,152

- 'v RESISTANCE x Filed May 29. 195'/ ZZ i v Z4 l. I 13 24 f i i .llll

Illlll'llll`l Bew/je J. Mur/1er hun., Kama, w-"DrmoSC ATTORN EY PatentedApr. 4, 1939 PATENT oFFlcE RESISTANCE vGeorge J. Mucher, Brooklyn, N.Y., assigner tor Clarostat Manufacturing Co. Inc., Brooklyn, N. Y., acorporation of New York Application May 29, 1937, Serial No. 145,410

4 Claims.

i This invention relates to a structurally and functionally improvedresistance capable of use y in numerous different associations, butprimarily intended to be employed in radio 'receiving and 5 transmittingapparatus.

It is an object of the invention to furnish a resistance which will beof extremely compact and rugged character, such resistance being sosupported that it is capable of being connected .u into or disconnectedfrom a circuit.

A further object of the invention is that of providing a resistancewhich `rwill not become overheated and in which, under no circumstances,will the terminals be detrimentally laffected by 5 heat.

Another object is that of providing a unitary resistance including anynumber of desired values.

An additional object is that 'of providing units of this character whichmay readily be manul factured largely by ordinary machines and methodsyand also by unskilled labor so that 'an extremely satisfactory devicehaving a long period of effective use may be produced at nominal cost.With these and other objects in mind, reference i is had to the attachedsheet of drawing illustrating one practical embodiment of the invention,and in which:

Fig. 1 is a sectional side view-of the resistance showing the same inpartly assembled condition;

l0 Fig. 2 is a transverse sectional view taken through Fig. 1, but'showing the parts in completely assembled condition;

Fig. 3 is a bottom plan view of the base of the unit;

l5 Fig. 4 is a side Velevation of the unit, showing certain of the partsbroken away to disclose underlying construction;

Fig. 5 is an enlarged view'of a fragment of the resistance mountingelement, and

lo Fig. 6 is a transverse sectional view taken along the line I-S and inthe direction of: the arrows of Fig. 5. y

In these views the numeral I0 indicates a base which is preferably inthe form of a standard lamp base from which extends a centering plug IIand an annular series of hollow terminal' The plug II may have extendingmembers I2. from its face a positioning rib or iin I3 which,

in accordance with well known practice cooperates with the slot or notchin the socket receiving the base in order to properly position theparts.

A shell I4- of metal or other heat dissipating material is securedto thebase preferably by having the latter notched and undercut at a pluralityof points indicated at I6 and slitting (C1. zul-67) J.

the lower edge of case I4 to provide a plurality.

of locking tongues I6 extendable into these notches as best shown inFigs. 2 and 3. Extending above the central portion of base I0 is asupport I1 preferably comprising a thin 5 body of mica or similarmaterial. 'I'he mounting of this body'is conveniently effected by havingvthe same perforated adjacent its lower and outer is formed with notches20. It is to be observed that in its upper edge the sheet Il presentsadjacent its side edges extended portions 2l which preferably projectbeyond the plane normally 2 occupied by the inner end surface of thetube or shell I5 when the latter is completely mounted` upon the base.Moreover, sheet Il may be formed with openings 22 and a resistance wire23 extends from end to end of the sheet and is 25 maintained againstdisplacement by resting within the notches.

The ends of this Wire are coupled to the pins I9 which provide themounting for sheet Il and at this time it is to be noted that theresistance a0' may be tapped at any number of desired points. One ofthese has been indicated in Figs. 1 and 2, it being noted that a pin 24is coupled to the wire at this point, preferably by employing an eyeletsuch as I8 which extends through one of 85 the openings'22, throughwhich opening also wire 23 is passed. This wire additionally may beextended through the adjacent notch 20 so thatthe possibility ofdislodgment is reduced to an utter minimum. Pin 24, as best shown inFig. 2, is extended outwardly and downwardly into one of the terminalelements I2 in the manner previously described in connection with pin I9.

Thus, in this resistance three resistance values are present, to wit:(a) from the terminal in which one pin I9 is disposed to the terminal inwhich the second pin Isis arranged, (b) from the left hand terminal I9to the terminal with which pin 24 is associated, and (c) from the 50terminal with which the right hand pin I! (as viewed in Fig. 1) isassociated to the terminal within which pin 24 is disposed. It is, ofcourse, to be appreciated that the resistance might be tapped at anynumber or additional points, but

this has not been shown with a view to avoiding undue complication ofthe illustration.

It is apparent that air may circulate within the tube or shell Il,around the ends of sheet I1. It may, moreover, circulate throughopenings 22, and in view of the heat dissipating character of tube Il,the temperatures will be always malntained weil below any point at whichdamage mightoccur. As afore brought out, sheet I1 is firmly mounted bythe pins which are attached thereto and incident to the fact that thewidth' of this sheet is preferably equivalent to the diameter of thetube, no relative sidewise movement of the parts may occur. Moreover, asatore mentioned the portions 2| divide into such a plane that the tube,when fully mounted, will engage the upper edges of the same. This has atendency to spread these upper edges as better indicated in Figs. 2 and4, thus locking the sheet against further movement. The pins I9, 24,will of course be immovably secured with respect to the terminals withinwhich they are disposed by utilizing solder, compressing theseterminals, or otherwise.

Thus, an extremely unitary structure is presented and one in which ltheterminals are well below the source of heat. Consequently an accidentaldetachment of these terminals due to this cause is precluded. Moreover,being normally mounted in a vertical plane, there is little if anylikelihood of the resistance coils breaking, even if the parts aresubjected to a violent jarring action. However, to still furtherpreclude the possibility of breaking, it will be observed, as in Figs. 5and 6, that the surface of sheet i1 is preierably coated with a layer ofcement, varnish, or other suitable material as indicated at 25, andcoils 23 are applied while this material is still in a plastic or tackycondition. Consequent" ly, each individual convolution of the coils willbe somewhat embedded in the layer, thus an."- choring the same againstmovement. Addition-n ally, this layer will key through the openings 2iaround the edges of notches 20, etc., and will serve as an envelope forsheet l'l, preventing any deterioration thereof even under extreme confditions. This is especially desirable if the sheet is formed of mica inthat substantially no disintegration or bulging of the parts will occur.

Thus, among others, the several objects oi the invention as afore notedare achieved. It will be appreciated that numerous changes inconstruction and rearrangements of the parts might be resorted towithout departing from the spirit of the invention as defined by theclaims.

Having described my invention, what I claim as new and desire to secureby Letters Patent is:

1. A resistance including a sheet oi insulated material, a resistancewire encircling said sheet, a base, means connected to said Wire and tosaid base for mounting said sheet, and a shell also mounted by said baseand having an internal diameter substantially equivalent to the width orsaid sheet the side edges of said sheet having slidable contact with theinner face of said shell at diametrically oposite points within thesame. 2. A resistance including a sheet of insulated material, aresistance wire encircling said sheet, a base, means connected to saidwire and to said base for mounting said sheet, and a shell also mountedby said base, and projecting portions formed adjacent one of the ends ofsaid sheet and extending into a plane beyond that normally occupied bysaid shell whereby said shell in being applied to said base willdeformably engage said projecting portions to provide parts extending toboth sides of said sheet and in bracing contact against the inner faceof said shell. 3. A resistance including an insulating mem ber,resistance wire disposed thereon, a base, means connected to saidresistance wire and said base ior mounting said insulating member, ashell for cooperation therewith, said shell being formed with a domedtop portion, the height of said shell at its side edges being slightlyless than that oi said insulating member whereby the inner surface oisaid shell dome engages at its peripheral edges with the upper edge cisaid insulating member when said shell is positioned on said base andengages such insulating mem ber in bracing Contact.

fi. A resistor including a fiat insulating inemm bei', resistance wirecarried thereby, a base, means connected to said wire and to said baseror mounting said fiat insulating member, a shell also mounted on saidbase, the inner surface oit' said shell deformably engaging portions oi.said flat insulating member and maintaining said :dat insulating memberin a fixed position within said shell.

GEORGE J. M'UCHER.

